plug into verb4 •To connect an electric device into something using a plug.I spent ages trying to fix my computer, before realizing that it wasn't plugged into the wall. •(figurative) To join something in the manner of a plug. •To replace a variable with a number in order to solve an equation.If you know two sides of a right triangle, you can find the third by plugging them into the Pythagorean Theorem. •To become aware of or knowledgeable about. formsplugged into · plugging into · plugs into